Species of Tenthredinidse. 255 



Genus Lyda, Fabr. 

 Lyda flagellicornis. 



L. melleo-flava ; antennis prselongis, apice graduatim attenuatis ; alis 

 pallide flavo-hyalinis, apice fusco late terminato. 



Female. Length 5 lines. Darkish honey-yellow, smooth 

 and shining ; the antennae longer than the body, setaceous ; the 

 scape, basal joint of the flagellum, and the joints (12-18) yellow, 

 the rest of a blackish brown ; the region of the ocelli and middle 

 of the pectus black; the wings pale yellowish-hyaline, their 

 apex broadly fuscous. 



Hab. North China. Robert Fortune, Esq. 



Genus Derecyrta. 



Head subglobose, the vertex swollen or convex; the eyes 

 lateral, large and ovate ; the ocelli prominent, and placed in a 

 triangle between the eyes ; the antenna setaceous, composed of 

 23 joints ; the scape short, curved, and slightly thickened to- 

 wards the apex ; the first joint of the flagellum half the length 

 of the scape, the second as long as the scape, the third and four* 

 following joints as long as the first ; the remaining joints are 

 each in succession shorter than the preceding. Thorax as wide 

 as the head, oblong, the sides parallel ; the prothorax narrowed 

 anteriorly into a short neck ; the mesothorax slightly elevated 

 in front ; the scutellum elevated ; the anterior wings with one 

 marginal and four submarginal cells; the marginal cell elon- 

 gate, with a short appendix at the apex; the first submarginal 

 cell small, the second oblong, widest at the apex, the third sub- 

 quadrate, the fourth extending to the apex of the wing; the 

 second and third cells each receive a recurrent nervure a little 

 within near their base ; the tibiae bispinose at their apex. Abdo- 

 men cylindrical, about twice the length of the head and thorax ; 

 the ovipositor short, and slightly exserted. 



Derecyrta pictipennis. 



D, ochracea, nitida ; capite, abdominis apice, antennis pedibusque 

 nigris ; alis fuscis, basi fasciaque transversali flavo-hyalinis. 



Female. Length 9 lines. Head shining black, smooth and 

 impunctate behind the ocelli, coarsely and irregularly striated 

 before them ; the mandibles short, stout, and armed with three 

 acute teeth, striated externally. Thorax ochraceous, shining; 

 the mesothorax with three deep longitudinal grooves, the spaces 

 between them transversely and coarsely striated, beyond the 

 grooves finely punctured ; the scutellum and metathorax finely 

 punctured; wings brown, their base flavo -hyaline ; a broad flavo- 

 hyaline fascia crosses the wings at the base of the marginal cell ; 



